Effect of Alumina Fluoridation on Hydroconversion ofn-Heptane on Sulfided NiW/Al2O3Catalysts

Benitez, A.; Ramirez, Jorge; Cruz-Reyes, J.; Agudo, Antonio

doi:10.1006/jcat.1997.1848

Cited by 13 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A similar behavior was also found for sulfided NiMo/HY (281). Hydroconversion of n-heptane on sulfided NiW catalysts, supported on alumina modified with various amounts of fluoride, have been studied (285). It was found that alumina fluoridation increases the catalytic activity and provides a higher hydroisomerization selectivity of n-C 7 to 2-and 3-methyl hexanes.…”

Section: Other Potentially Important Catalysts For Hydroconversion Ofmentioning

confidence: 99%

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

2007

View full text Add to dashboard Cite

Section: Other Potentially Important Catalysts For Hydroconversion Ofmentioning

confidence: 99%

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

2007

View full text Add to dashboard Cite

“…Alkanes are dehydrogenated on the metallic sites and then isomerized or cracked on the acid sites through classical and non-classical carbenium ion chemistry [12][13][14]. The most conventional hydrocracking catalysts used for the production of gasoline or diesel from crude oil are NiMo and NiW catalysts supported on alumina [15], silica-alumina [16], fluorine-doped alumina [17], USY zeolite [18], and molecular sieves [19]. Pd or Ptloaded solid acid catalysts have also been investigated for the hydrocracking of heavy hydrocarbons [20].…”

Section: Introductionmentioning

confidence: 99%

Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO2–Al2O3 Catalysts: Effect of SiO2–Al2O3 Composition on Acid Property and Catalytic Performance of NiMo/SiO2–Al2O3 Catalysts

et al. 2008

View full text Add to dashboard Cite

SiO 2 -Al 2 O 3 supports with different composition were prepared by a precipitation method in order to control the acid property of SiO 2 -Al 2 O 3 supports. NiMo/ SiO 2 -Al 2 O 3 catalysts were then prepared by an impregnation method and sulfided for use in the production of middle distillate through hydrocracking of paraffin wax. It was revealed that MoS 2 phase was dominantly formed in the NiMo/SiO 2 -Al 2 O 3 catalysts, while Ni-Mo-S phase was not detected due to its fine dispersion. Acidity of NiMo/SiO 2 -Al 2 O 3 catalysts measured by NH 3 -TPD experiments showed a volcano-shaped curve with respect to SiO 2 content. Acidity of the catalysts played an important role in determining the catalytic performance in the hydrocracking of paraffin wax. Conversion of paraffin wax was monotonically increased with increasing acidity of the catalyst, while yield for middle distillate showed a volcano-shaped curve with respect to acidity of the catalyst. Thus, optimal acidity of NiMo/SiO 2 -Al 2 O 3 catalysts was required for the maximum production of middle distillate through hydrocracking of paraffin wax.

show abstract

“…While the formation of light hydrocarbons can be explained by C–C bound cleavage caused by hydrogenolysis, which is favored at higher temperatures, heptane cracking does not seem to contribute significantly to the gas products since the C 3 /C 4 ratio is significantly higher than 1 (Figure B). Indeed, on sulfided catalysts, like NiMoS/P–Al 2 O 3 , heptane hydroconversion occurs preferably through β-scission, yet this mechanism only becomes relevant at temperatures above the ones used in this study, i.e., T > 400 °C. , Instead, light hydrocarbons most likely result from the cleavage of larger molecules from crude oil during the hydrotreatment reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Indeed, on sulfided catalysts, like NiMoS/P−Al 2 O 3 , heptane hydroconversion occurs preferably through β-scission, yet this mechanism only becomes relevant at temperatures above the ones used in this study, i.e., T > 400 °C. 40,41 Instead, light hydrocarbons most likely result from the cleavage of larger molecules from crude oil during the hydrotreatment reaction.…”

Section: Hydrotreatment Of Lignite Htl Crudementioning

confidence: 99%

Hydrocarbon Fuels from Sequential Hydrothermal Liquefaction (HTL) of Lignite and Catalytic Upgrading of Crude Oil

Batalha,

Checa,

Lorentz

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

Lignite from Belchatów in Poland was converted to hydrocarbon fuels, particularly in the kerosene and diesel ranges, through sequential hydrothermal liquefaction (HTL) and hydrotreatment (HDT) of the obtained crude oil. Different HDT temperatures were investigated (from 350 °C up to 390 °C). Despite the highly aromatic nature and high heteroatom content, the HTL lignite crude oil could undergo deep hydrodesulfurization (HDS = 99%) and hydrodeoxygenation (HDO = 98%) in a single HDT treatment stage, yielding a liquid product rich in aliphatic and aromatic, particularly monoaromatic, hydrocarbons. The hydrotreatment and hydrogenating capacity of the lignite crude oil was linked to the low concentration of compounds resistant to hydrotreatment in lignite and, consequently, lignite’s crude oil, permitting the easy transformation of the crude oil into hydrocarbon fuel. Still, the significant concentration of aromatic compounds, particularly monoaromatic and diaromatic, in the liquid product (≈45% of fuel range products) suggests that further upgrading, blending, or harsher HDT conditions might be necessary to improve the fuel quality. In addition to the crude oil, the HTL of lignite yielded a stream of char, which displayed a higher calorific value and lower heteroatom content than the original lignite feedstock, thus having a high potential for electricity production, which is the common use of lignite. Thus, introducing an HTL stage to extract crude oil before lignite use in electricity production could provide an alternative fuel source used as a strategy to increase multiple countries’ energetic independence.

show abstract

Effect of Alumina Fluoridation on Hydroconversion ofn-Heptane on Sulfided NiW/Al2O3Catalysts

Cited by 13 publications

References 25 publications

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

Recent Advances and Future Aspects in the Selective Isomerization of High n‐Alkanes

Production of Middle Distillate Through Hydrocracking of Paraffin Wax over NiMo/SiO2–Al2O3 Catalysts: Effect of SiO2–Al2O3 Composition on Acid Property and Catalytic Performance of NiMo/SiO2–Al2O3 Catalysts

Hydrocarbon Fuels from Sequential Hydrothermal Liquefaction (HTL) of Lignite and Catalytic Upgrading of Crude Oil

Contact Info

Product

Resources

About